👉 Thightness is a term in physics, specifically in the field of optics, which refers to the ability of an object to bend light into its desired path. It involves the phenomenon where when light passes through a material or medium that has a high refractive index (i.e., one with a lower dispersion), it bends the light and creates a focus. This effect is known as refraction. For example, consider a lens, such as a convex lens in front of an object. When light